picking a EEPROM

Archiver

Can anyone please help me find a good EEPROM. I have no idea on what to look for. I am doing digital dash, and I need to store a few things like the odometer value ( three byte sizes ) the trip ( three byte sizes ) and about 6 more byte sizes to store. I need it to be able to write to the same location about 10,000,000 times ( maybe ).

thanks

TC

Archiver

I usually look at the 24LCXX serries. You can get them in sizes from 128bytes to >64K.· I have not seen any eeproms with a 10m write cycle rating however. Most EEProms are rated to 100,000 or 1,000,000 write cycles.

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Original Message

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From: Anthony Conti
To: basic stamp
Sent: Thursday, May 24, 2001 2:25 PM
Subject: [noparse][[/noparse]basicstamps] picking a EEPROM

Can anyone please help me find a good EEPROM. I have no idea on what to look for. I am doing digital dash, and I need to store a few things like the odometer value ( three byte sizes ) the trip ( three byte sizes ) and about 6 more byte sizes to store. I need it to be able to write to the same location about 10,000,000 times ( maybe ).

thanks

TC

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Archiver

Hi TC,

10 million write cycles is pretty high for an EEPROM. The 64k and
smaller 24LCxxx EEPROMs from Microchip are guaranteed for 1,000,000
read/write cycles. (You could always socket the EEPROM and replace as
needed...) Maybe NVRAM would be an option also. There are various
sizes and can be written to/read from nearly an infinite amount of
times.

I've designed a product which adds up to 256k EEPROM without changing
the footprint of the BS2. You get a Real-time clock and an I2C buss
to boot: http://www.high-techgarage.com/products/timekeeper.php

If you need more than 64k and still need the high number of write
cycles, use and I2C type serial EEPROM. Most have a2,a1,a0 pins which
allow you to put up to 8 identical EEPROMs on the same 2 lines (data
and clock). You could then have 64k x 8 or EEPROM. You can find a
tutorial for 2-wire serial EEPROM at:
http://www.high-techgarage.com/tutorial/i2c.php

Good luck with your project!
--Jeff Wallace

* Add a RTC, EEPROM, 8-channel ADC and 8 extra I/O pins to your BS2
http://www.high-techgarage.com/products/supermax.php


--- In basicstamps@y..., "Anthony Conti" <aconti@n...> wrote:
> Can anyone please help me find a good EEPROM. I have no idea on
what to look for. I am doing digital dash, and I need to store a few
things like the odometer value ( three byte sizes ) the trip ( three
byte sizes ) and about 6 more byte sizes to store. I need it to be
able to write to the same location about 10,000,000 times ( maybe ).
>
> thanks
>
> TC